Shelf unit



FIG. 1 is a top front perspective view of a shelf unit in accordance with the present invention;

FIG. 2 is a bottom front perspective view thereof;

FIG. 3 is a top rear perspective view thereof;

FIG. 4 is a bottom rear view perspective view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is a rear view thereof;

FIG. 7 is a left view thereof;

FIG. 8 is a right view thereof;

FIG. 9 is a top view thereof; and,

FIG. 10 is a bottom view thereof.

The broken line showing portions of the shelf unit illustrates portions of the article and forms no part of the claimed design. 

CLAIM The ornamental design for a shelf unit, as shown and described. 